[ClusterLabs] Adding a node to an active cluster

[Igor Tverdovskiy]

Hi Jiaqi,

The most reliable way to add a new node according to my practice is the
following:
1. update corosync.conf files among all hosts in cluster including the new
node
2. copy corosync auth file to the new node
3. enable maintenance:
a) sudo crm configure property maintenance-mode=true
When global maintenance mode is enabled you may safely stop pacemaker and
corosync services

b) sudo crm status
ensure it is enabled on all nodes(it is global mode, but if you have
split-brain not all nodes can be affected by command)
4. stop pacemaker and corosync services on all nodes
5. start pacemaker and corosync services on all node *on by one (one node
at a time)*

After this you will have all nodes in a cluster. You may try to do a simple
restart of pacemaker and corosync services without stopping them and
without starting in a sequence, but this will not always work.


On Wed, Oct 21, 2020 at 5:03 PM Jiaqi Tian1 <Dylan.Jiaqi.Tian at ibm.com>
wrote:

> Hi,
> I'm trying to add a new node into an active pacemaker cluster with
> resources up and running.
> After steps:
> 1. update corosync.conf files among all hosts in cluster including the new
> node
> 2. copy corosync auth file to the new node
> 3. enable corosync and pacemaker on the new node
> 4. adding the new node to the list of node
> in /var/lib/pacemaker/cib/cib.xml
>
> Then I run crm status, the new node is displayed as offline. It will not
> become online, unless we run restart corosync and pacemaker on all nodes in
> cluster. But this is not what we want, since we want to keep existing nodes
> and resources up and running. Also in this case crm_node -l doesn't list
> the new node.
>
> So my question is:
>
> 1. Is there another approach to have the existing nodes aware of the new
> node and have crm status indicates the node is online while keeping other
> nodes and resources up and running?
> 2. which config file crm_node command reads?
>
> Thanks,
>
> Jiaqi Tian
>
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